Our partnerAndover Corp.

Steep-edge longpass filters

from Andover

Our steep-edge long pass filters employ magnetron sputtered hard oxide coatings to yield deep rejection and a sharp transition to very high transmission. The coatings are deposited on precision polished fused silica substrates, and do not employ any absorbing filter glasses, making them suitable for high-temperature applications. They are offered in three standard sizes, with custom sizes available on request.

  • Useful for redirecting a particular band of light
  • Provide very steep (≤1%) cut-on slopes
  • Suitable for high-temperature applications
  • Can be cut or machined to smaller sizes


General Specifications
Thickness1.5±0.25 mm
Size Tolerance+0.0/-0.2 mm
Min. Clear Aperature85% of outside dimension
Substrate MaterialUV Grade Fused Silica
Flatness≤1/4 wave/inch TWF
Surface Quality60-40 per MIL-C-48497A
Humidity and AbrasionPer MIL-C-675A
DurabilityPer MIL-C-48497A
Operating Temperature-50 °C to +200 °C
Transmission≥91% average
Rejection≥OD 4.0
Cut-on Slope1% maximum
Cut-on Tolerance±1%
Optional: Mounted in threaded ring - contact our expert on the right for thread sizes

All filters are available in 12,5 mm Ø, 25 mm Ø, 50 mm Ø and 50 mm SQ

50% PointRejection BandTransmission BandPart Number
325 nm200-315 nm335-660 nm325SC01
350 nm200-340 nm360-700 nm350SC01
375 nm200-365 nm385-750 nm375SC01
400 nm200-390 nm408-800 nm400SC01
450 nm200-440 nm458-900 nm450SC01
500 nm200-490 nm508-1000 nm500SC01
550 nm200-539 nm560-1100 nm550SC01
600 nm200-588 nm610-1200 nm600SC01
650 nm200-637 nm660-1300 nm650SC01
700 nm200-686 nm710-1400 nm700SC01


Color Enhancement and Combining
Laser studies


Ing. Fabrizio Renzi
Ing. Fabrizio Renzi


Quantum Design s.r.l.

Via Francesco Sapori, 27
00143 Roma

Phone:+39 06 5004204
Fax:+39 06 5010389
Fabrizio RenziProduct Manager
+39 06 5004204